Fixed-Wing UAV Crashed 10 Seconds After Bungee Launch – Need Log Analysis

ArduPlane Plane 4.6
1

I need help analyzing my last flight test logs.

Vehicle Type: Fixed-wing UAV launched using bungee

The drone was launched successfully using a bungee launcher and initially after around 10 seconds of flight, the drone suddenly lost stability and crashed to the ground.
I have attached the .bin flight log for analysis.

Could someone please help review the logs and identify the possible cause of the crash?

Thank you.

logs.zip (765.8 KB)

2

I wouldn’t agree. The plane wasn’t so much flying, as being thrown into the air. It was never really in control. The plane basically pitch up and flipped over.

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image1227×673 95.9 KB

The flight controller was commanding corrections to the servos but they seemed to have little effect. I would check:

  • Are the flight controls moving in the correct direction for stabilisation. Especially the V-tail. Those are easy to get backwards.
  • Verify that the centre of gravity is correct. Given the climb it could be too far aft.
3 Likes
3

Another log file, 7.bin, shows a successful flight without any crash. The other two .bin files also indicate crash flights. Please check the logs .
Thank you for your response.

https://drive.google.com/drive/u/0/folders/1Rs72xdjcFYh3MKie5Uxi1kuuolq0WYUk